Non-Gaussianity from Attractor Curvaton

TL;DR

This paper introduces a curvaton model where attractor dynamics during inflation set initial conditions, leading to significant non-Gaussianity in curvature perturbations, with testable predictions and implications for early universe physics.

Contribution

It presents a novel attractor-based initial condition mechanism for the curvaton, enhancing non-Gaussianity predictions in inflationary cosmology.

Findings

Attractor behavior determines initial curvaton conditions during inflation.

The model predicts sizable non-Gaussianity in curvature perturbations.

Implications for the universe's thermal history and particle physics are discussed.

Abstract

We propose a curvaton model in which the initial condition of the curvaton oscillation is determined by its attractor behavior during inflation. Assuming a chaotic inflation model, we find that the initial condition determined by the attractor behavior is appropriate to generate a sizable non-Gaussianity contribution to the curvature perturbation, which will be tested in the foreseeable future. Implications on the thermal history of the universe and on particle physics models are also discussed.